CVE Catalog

CVE-2026-110310

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.51%

42th percentile - higher than 42% of all known CVEs

Summary

A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS#1 v1.5 padding oracle to recover the RSA-wrapped envelope key and decrypt the object.

Risk Assessment

A party with read access to encrypted objects can decrypt their contents, leading to a breach of data confidentiality.

Recommendation

Upgrade to version 3.2.2 or 4.0.3; users of the 1.x and 2.x lines must migrate, as those versions will not be patched.

Related vulnerabilities

Original NVD description (English source)

A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS#1 v1.5 padding oracle to recover the RSA-wrapped envelope key and decrypt the object. To remediate this issue, we recommend that users upgrade to version 3.2.2 or 4.0.3. The 1.x and 2.x lines will not be patched, users of those lines need to migrate to 3.2.2 or 4.0.3.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS